/*

 * Licensed to the Apache Software Foundation (ASF) under one

 * or more contributor license agreements.  See the NOTICE file

 * distributed with this work for additional information

 * regarding copyright ownership.  The ASF licenses this file

 * to you under the Apache License, Version 2.0 (the

 * "License"); you may not use this file except in compliance

 * with the License.  You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

package com.bff.gaia.unified.sdk.extensions.sql.meta.provider;



import com.bff.gaia.unified.sdk.extensions.sql.UnifiedSqlTable;

import com.bff.gaia.unified.sdk.extensions.sql.meta.Table;

import com.bff.gaia.unified.sdk.schemas.Schema;

import com.bff.gaia.unified.vendor.guava.com.google.common.collect.ImmutableMap;



import java.util.Map;



/**

 * A {@code ReadOnlyTableProvider} provides in-memory read only set of {@code UnifiedSqlTable

 * UnifiedSqlTables}.

 */

public class ReadOnlyTableProvider implements TableProvider {

  private final String typeName;

  private final Map<String, UnifiedSqlTable> tables;



  public ReadOnlyTableProvider(String typeName, Map<String, UnifiedSqlTable> tables) {

    this.typeName = typeName;

    this.tables = tables;

  }



  @Override

  public String getTableType() {

    return typeName;

  }



  @Override

  public void createTable(Table table) {

    throw new UnsupportedOperationException(

        "ReadOnlyTableProvider does not support table creation");

  }



  @Override

  public void dropTable(String tableName) {

    throw new UnsupportedOperationException(

        "ReadOnlyTableProvider does not support table deletion");

  }



  @Override

  public Map<String, Table> getTables() {

    ImmutableMap.Builder<String, Table> map = ImmutableMap.builder();

    for (Map.Entry<String, UnifiedSqlTable> table : tables.entrySet()) {

      map.put(

          table.getKey(),

          Table.builder()

              .type(getTableType())

              .name(table.getKey())

              .schema(Schema.builder().build())

              .build());

    }

    return map.build();

  }



  @Override

  public UnifiedSqlTable buildUnifiedSqlTable(Table table) {

    return tables.get(table.getName());

  }

}